NGC 4945
E476789
NGC object
Seyfert 2 galaxy
active galaxy
barred spiral galaxy
extragalactic object
starburst galaxy
NGC 4945 is a nearby, edge-on barred spiral galaxy in the constellation Centaurus, notable for its active galactic nucleus and intense star-forming activity.
All labels observed (1)
| Label | Occurrences |
|---|---|
| NGC 4945 canonical | 4 |
How this entity was disambiguated
This entity first appeared as the object of triple T4835294 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: NGC 4945 Context triple: [Centaurus A/M83 Group, containsGalaxy, NGC 4945]
-
A.
NGC 5236
NGC 5236, also known as the Southern Pinwheel Galaxy or Messier 83, is a bright, nearby barred spiral starburst galaxy prominent in the constellation Hydra.
-
B.
NGC 5128
NGC 5128, also known as Centaurus A, is a nearby peculiar elliptical galaxy with a prominent dust lane and one of the strongest radio sources in the sky.
-
C.
NGC 2403
NGC 2403 is a nearby spiral galaxy in the constellation Camelopardalis, notable for its active star formation and numerous observed supernovae.
-
D.
NGC 2976
NGC 2976 is a nearby dwarf spiral galaxy in the constellation Ursa Major and a member of the M81 Group of galaxies.
-
E.
NGC 4725
NGC 4725 is a barred spiral galaxy in the constellation Coma Berenices, notable for having only one prominent spiral arm.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: NGC 4945 Target entity description: NGC 4945 is a nearby, edge-on barred spiral galaxy in the constellation Centaurus, notable for its active galactic nucleus and intense star-forming activity.
-
A.
NGC 5236
NGC 5236, also known as the Southern Pinwheel Galaxy or Messier 83, is a bright, nearby barred spiral starburst galaxy prominent in the constellation Hydra.
-
B.
NGC 5128
NGC 5128, also known as Centaurus A, is a nearby peculiar elliptical galaxy with a prominent dust lane and one of the strongest radio sources in the sky.
-
C.
NGC 2403
NGC 2403 is a nearby spiral galaxy in the constellation Camelopardalis, notable for its active star formation and numerous observed supernovae.
-
D.
NGC 2976
NGC 2976 is a nearby dwarf spiral galaxy in the constellation Ursa Major and a member of the M81 Group of galaxies.
-
E.
NGC 4725
NGC 4725 is a barred spiral galaxy in the constellation Coma Berenices, notable for having only one prominent spiral arm.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
NGC object
ⓘ
Seyfert 2 galaxy ⓘ active galaxy ⓘ barred spiral galaxy ⓘ extragalactic object ⓘ starburst galaxy ⓘ |
| apparentMagnitudeV | ~9.3 ⓘ |
| apparentSize | 20.0 × 3.8 arcminutes ⓘ |
| belongsTo | Centaurus A/M83 Group ⓘ |
| catalogDesignation |
ESO 219- G 010
ⓘ
NGC 4945 ⓘ PGC 45279 ⓘ |
| constellation | Centaurus ⓘ |
| contains | supermassive black hole ⓘ |
| declination | −49° 28′ 05″ ⓘ |
| discoveredBy | James Dunlop ⓘ |
| discoveryYear | 1826 ⓘ |
| distanceFromEarth |
~11.7 million light-years
ⓘ
~3.6 Mpc ⓘ |
| dustObscuration | strong in optical band ⓘ |
| galaxyType | barred spiral galaxy ⓘ |
| groupMembership |
Centaurus A Group
ⓘ
linked to:
Centaurus A/M83 Group
|
| hasFeature |
active galactic nucleus
ⓘ
bar structure ⓘ circumnuclear starburst ⓘ dust lane ⓘ prominent disk ⓘ |
| hasProperty |
heavily obscured by dust
ⓘ
high infrared luminosity ⓘ intense star formation ⓘ |
| hasStarFormationRegion | nuclear starburst ring ⓘ |
| hostGalaxyOf | active galactic nucleus ⓘ |
| isMemberOf | local volume galaxies ⓘ |
| isNearbyTo |
Centaurus A (NGC 5128)
ⓘ
linked to:
NGC 5128
|
| morphologicalType | SB(s)cd ⓘ |
| nuclearActivityType | Seyfert 2 ⓘ |
| observedIn |
X-ray wavelengths
ⓘ
gamma-ray wavelengths ⓘ infrared wavelengths ⓘ radio wavelengths ⓘ |
| orientation | edge-on ⓘ |
| radialVelocity | ~563 km/s ⓘ |
| redshift | 0.001878 ⓘ |
| rightAscension | 13h 05m 27s ⓘ |
| similarTo |
Milky Way
ⓘ
NGC 253 ⓘ |
| spectralFeature |
obscured nucleus
ⓘ
strong X-ray emission ⓘ strong infrared emission ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: NGC 4945 Description of subject: NGC 4945 is a nearby, edge-on barred spiral galaxy in the constellation Centaurus, notable for its active galactic nucleus and intense star-forming activity.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.